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dm: simplify start of block stats accounting for bio-based 

No apparent need to generic_start_io_acct() until before the IO is ready
for submission.  start_io_acct() is the proper place to do this
accounting -- it is also where DM accounts for pending IO and, if
enabled, starts dm-stats accounting.

Replace start_io_acct()'s part_round_stats() with generic_start_io_acct().
This eliminates needing to take part_stat_lock() multiple times when
starting an IO on bio-based devices.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2017-12-17 11:56:48 -05:00
parent bc02cdbe53
commit f3986374f9
1 changed files with 3 additions and 8 deletions
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11
drivers/md/dm.c
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@ -599,16 +599,14 @@ static void start_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
struct bio *bio = io->orig_bio;
int cpu;
int rw = bio_data_dir(bio);
io->start_time = jiffies;
cpu = part_stat_lock();
part_round_stats(md->queue, cpu, &dm_disk(md)->part0);
part_stat_unlock();
generic_start_io_acct(md->queue, rw, bio_sectors(bio), &dm_disk(md)->part0);
atomic_set(&dm_disk(md)->part0.in_flight[rw],
atomic_inc_return(&md->pending[rw]));
atomic_inc_return(&md->pending[rw]));
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
@ -1556,15 +1554,12 @@ static void __split_and_process_bio(struct mapped_device *md,
*/
static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
int srcu_idx;
struct dm_table *map;
map = dm_get_live_table(md, &srcu_idx);
generic_start_io_acct(q, rw, bio_sectors(bio), &dm_disk(md)->part0);
/* if we're suspended, we have to queue this io for later */
if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) {
dm_put_live_table(md, srcu_idx);